When visiting Turkey, a must see are the archaeological ruins of Ephesus (or Efes in Turkish) near the town of Selçuk. Ephesus was an ancient Greek city and Roman city, and there are several reconstructed ruins scattered all over, even though most have been destroyed either due to natural disasters or ancient wars. The façade of the Library of Celsus is one of the many ruins that stands out. Built in honor of a Roman official, Celsus, who is supposedly buried in a crypt beneath the library, it once held 12,000 scrolls. Throughout the day, the sun highlights the stones/marble of the façade and casts shadows from various angles between the columns and statues. It's a great place to learn more about ancient Greek and Roman history.